package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;

import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1.获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> queryParams = request.getQueryParams();
        //2.获取参数中的authorization参数
        String authorization = queryParams.getFirst("authorization");
        //3.判断参数值是否等于admin
        if ("admin".equals(authorization)) {
            //4.是，放行
            return chain.filter(exchange);
        }
        //设置状态码
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        //5否,拦截
        return exchange.getResponse().setComplete();
    }

    //过滤器的权重，越小越先执行
    //也可以用@Order(-1)注解
    @Override
    public int getOrder() {
        return -1;
    }
}
